Remove deprecated Strings class. Review URL: https://codereview.chromium.org//12295014 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@18686 260f80e4-7a28-3924-810f-c04153c831b5

diff --git a/pkgs/yaml/lib/model.dart b/pkgs/yaml/lib/model.dart
index 7a609b9..9f1474e 100644
--- a/pkgs/yaml/lib/model.dart
+++ b/pkgs/yaml/lib/model.dart

@@ -90,8 +90,7 @@
     return true;
   }
 
-  String toString() =>
-      '$tag [${Strings.join(content.map((e) => '$e'), ', ')}]';
+  String toString() => '$tag [${content.map((e) => '$e').join(', ')}]';
 
   int get hashCode => super.hashCode ^ _hashCode(content);
 
@@ -179,7 +178,7 @@
           }
         }
       });
-      return '"${Strings.join(escapedValue, '')}"';
+      return '"${escapedValue.join()}"';
     }
 
     throw new YamlException("unknown scalar value: $value");
@@ -193,7 +192,7 @@
     assert(length >= str.length);
     var prefix = [];
     prefix.insertRange(0, length - str.length, '0');
-    return '${Strings.join(prefix, '')}$str';
+    return '${prefix.join()}$str';
   }
 
   int get hashCode => super.hashCode ^ content.hashCode;

diff --git a/pkgs/yaml/test/yaml_test.dart b/pkgs/yaml/test/yaml_test.dart
index b939b67..901bd3d 100644
--- a/pkgs/yaml/test/yaml_test.dart
+++ b/pkgs/yaml/test/yaml_test.dart

@@ -1350,7 +1350,7 @@
       // TODO(nweiz): enable this when we throw an error for long keys
       // var dotList = [];
       // dotList.insertRange(0, 1024, ' ');
-      // var dots = Strings.join(dotList, '');
+      // var dots = dotList.join();
       // Expect.throws(() => loadYaml('[ "foo...$dots...bar": invalid ]'));
     });
   });